immersion immersion /ˌɪˈmɝːʒən/

noun

1. The act of wetting something by submerging it  ( dousing , ducking , immersion , submersion )
   the act of wetting something by submerging it
   
2. A form of baptism in which part or all of a person's body is submerged  ( immersion )
   a form of baptism in which part or all of a person's body is submerged
   
3. Complete attention; intense mental effort  ( absorption , engrossment , immersion , concentration )
   complete attention; intense mental effort
   
4. (astronomy) the disappearance of a celestial body prior to an eclipse  ( immersion , ingress )
   (astronomy) the disappearance of a celestial body prior to an eclipse
   
5. Sinking until covered completely with water  ( immersion , submergence , submerging , submersion )
   sinking until covered completely with water